The White House has pledged to begin troop withdrawals in July 2011, but the Karzai government doesn't expect to be ready until 2014. What does that mean for winding down operations?

President Obama has promised to begin withdrawing U.S. troops from Afghanistan in July 2011. But Afghan President Hamid Karzai has said his government won't be ready to take over the main burden of defending the country against Taliban insurgents until 2014 — a date U.S. officials are also increasingly talking about.

Does that mean adding three years to the U.S. clock? Not exactly.

Last year, when Obama decided to grant his military commanders' request for more troops in Afghanistan, he added a proviso to protect himself from the danger of endless, gradual escalation. This would be the last increase, he warned, and the added troops would be withdrawn beginning in July.

Predictably, the withdrawal date instantly became the focus of attention in both the United States and Afghanistan: Did it mean the Americans would abandon the battlefield, and that the Taliban merely had to wait them out before marching back to Kabul?

Obama and his lieutenants have said that is not the case, but they have given conflicting signals about what exactly the date signified. Vice President Joe Biden promised restive Democrats that there would be significant withdrawals; Defense Secretary Robert M. Gates insisted the withdrawals were likely to be modest. And administration officials struggled to explain what would happen after July 2011, partly because they hadn't figured it out themselves.

"There was a lot of confusion out there," a White House official acknowledged last week.

To the rescue, almost accidentally, came Karzai, who declared at his inauguration a year ago that Afghanistan would assume primary control over security within five years — that is, by the end of his term in 2014.

U.S. and other Western officials didn't take the date too seriously at first; it hadn't come from their strategic planning process, and it didn't seem realistic. (There's still plenty of doubt on that score.) But 2014 is increasingly being seen as a handy light at the end of the tunnel as the Obama administration toils to persuade other NATO countries to keep troops in the fight.

In July, an international summit in Kabul endorsed the goal. And at a NATO meeting in Lisbon this week, Gen. David H. Petraeus will unveil a more detailed timetable leading to 2014, providing — its authors hope — a reassuring framework under which European countries will agree to send more trainers and advisors to Afghanistan for the next several years.

In a broader sense, the 2014 date helps focus the debate on Afghanistan on something more important than the size of the drawdown that begins next July, which will be quite modest initially, if Gates and Petraeus have their way. The main goal of the war, after all, is to get Afghanistan to a point where much-improved Afghan security forces led by a much-improved government (neither of which exist yet) can take over.

The Obama administration is still heading toward a major review of the strategy next year. But if Gates and Petraeus can persuade Obama to accept the premise that 2014 is the right target, he may be less inclined to embark on a major de-escalation in 2011. Officials aren't too specific even about what a transfer of responsibility in 2014 would look like. They don't promise, for example, that it would mean an end to the U.S. combat mission in Afghanistan, as was accomplished this year in Iraq. And the date is a goal, not a deadline written in stone.

But they say the goal seems realistic, in part because of recent progress on at least two fronts — although they warn that the advances are mostly fragmentary, not decisive.

In Kandahar, the southern province U.S. officials consider to be the Taliban's most important base, Petraeus' commanders have claimed a series of tactical victories in killing insurgent commanders and routing Taliban units from areas where they had operated for years.

And on the training front, U.S. commanders say they are ahead of schedule in building a bigger and better Afghan army and police force, the organizations that must be in place to take over the battle in 2014.

The news isn't all good, however.

Many of the Taliban routed in Kandahar, for example, are believed to have fled to neighboring Pakistan to regroup. The United States has been pressing Pakistan to strike against Taliban "safe havens" on its territory with ground forces, but Pakistan has stalled; it has allowed the United States to increase drone strikes, but both sides say that's not as effective as a ground offensive would be.

And the long U.S. struggle to improve the effectiveness of Karzai's government and reduce the corruption that saps its public support has been largely unsuccessful. It's a sign of the importance Petraeus attaches to the issue that he has assigned one of the most accomplished American combat commanders of the Iraq war, Brig. Gen. H.R. McMaster, to lead a new anti-corruption campaign.